87. यदि समांतर श्रेढ़ी का सार्व अन्तर -2 है, तथा n वाँ पद a, तो a 17-213=
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87. यदि समांतर श्रेढ़ी का सार्व अन्तर -2 है, तथा n वाँ पद a, तो a 17-213=
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