श्रेणी 15+12+9+... के कितने पद लिये जायें कि इसका योग 15 हो जाय । दो उत्तरों की व्याख्या करें।
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Step-by-step explanation:
a = 9d = 17 - 9 = 8Sn = 636Sn = [ 2a + (n - 1) d ]⇒ 636 = [ 2 x 9 + (n - 1) x 8 ] ... की संख्या ऋणात्मक नहीं हो सकतीn = 12अत: पदों की संख्या 12 है।
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