1.

अनुक्रम 7,77,777,........ के n पदों तक का योग ज्ञात करे

Answer»

a = 7

d = 77 - 7

= 70

An = a + ( N - 1 ) d

= 7 + ( n - 1 ) ( 70 )

= 7 + 70n - 70

= - 63 + 70n



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