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समांतर श्रेणी

Question
CBSEHHIMAH10010178

निम्नलिखित समांतर श्रेढियों में से प्रत्येक में कितने पद हैं?
18 comma space 15 space 1 half comma space 13 comma space... comma space minus space 47

Solution
18 comma space 15 1 half comma space 13 comma space... comma space minus space 47
यहाँ, a= 18
straight d space equals space 15 space 1 half space minus space 18 space equals space 31 over 2 space minus space 18 equals space minus space 5 over 2
a= - 47
माना पदों की संख्या = n
तब, a= - 47
<pre>uncaught exception: <b>mkdir(): Permission denied (errno: 2) in /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php at line #56mkdir(): Permission denied</b><br /><br />in file: /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php line 56<br />#0 [internal function]: _hx_error_handler(2, 'mkdir(): Permis...', '/home/config_ad...', 56, Array)
#1 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/util/sys/Store.class.php(56): mkdir('/home/config_ad...', 493)
#2 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/FolderTreeStorageAndCache.class.php(110): com_wiris_util_sys_Store->mkdirs()
#3 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/RenderImpl.class.php(231): com_wiris_plugin_impl_FolderTreeStorageAndCache->codeDigest('mml=<math xmlns...')
#4 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/lib/com/wiris/plugin/impl/TextServiceImpl.class.php(59): com_wiris_plugin_impl_RenderImpl->computeDigest(NULL, Array)
#5 /home/config_admin/public/felixventures.in/public/application/css/plugins/tiny_mce_wiris/integration/service.php(19): com_wiris_plugin_impl_TextServiceImpl->service('mathml2accessib...', Array)
#6 {main}</pre>a + (n - 1)d = - 47
rightwards double arrow space 18 space plus space left parenthesis straight n space minus space 1 right parenthesis open parentheses space fraction numerator negative space 5 over denominator 2 end fraction space close parentheses space equals space minus space 47
rightwards double arrow space fraction numerator negative space 5 over denominator 2 end fraction left parenthesis straight n space minus space 1 right parenthesis space equals space minus space 47 space minus space 18
rightwards double arrow space fraction numerator negative space 5 over denominator 2 end fraction left parenthesis straight n space minus space 1 right parenthesis space equals space minus space 65
rightwards double arrow space 5 over 2 space left parenthesis straight n space minus space 1 right parenthesis space equals space 65
rightwards double arrow space straight n space minus space 1 space equals space fraction numerator 65 space cross times space 2 over denominator 5 end fraction
rightwards double arrow space straight n space minus space 1 space equals space 26
rightwards double arrow space straight n space equals space 26 space plus space 1 space
rightwards double arrow space straight n space equals space 27
अत: दी हुई A.P. में 27 पद हैं।