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प्रश्न
Find the 7th term of the progression 80 + 77 + 74 + ...
बेरीज
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उत्तर
This is an arithmetic progression with first term a1 = 80 and common difference d = 77 − 80 = −3.
an = a1 + (n − 1)d
a7 = 80 + 6(−3)
= 80 − 18
= 62
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