7²¹+7²²+7²³+7²⁴=.........?
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Answered by
0
7^21(1+7+7^2+7^3)
A geometric progression
7^21(1+7+7^2+7^3)
= 7^21(1 - 7^4)/(1 - 7)
=7^21(2400)/(6)
=7^21*400
Answered by
1
Answer:
400* 7²¹
Step-by-step explanation:
N = 7²¹+7²²+7²³+7²⁴ = 7²¹( 1 + 7 + 7² + 7³) = 400* 7²¹
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