Find the sum of 4+7+10+ to 20 terms using the formula
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Answered by
1
Answer:
the answer is 12940 in two digit
Answered by
1
Step-by-step explanation:
a=4
d=7-4=3
S20=n/2[2a+(n-1)d]
=20/2[2(4)+19(3)]
=10[8+51]
=10*59
=590
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