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সন্ধি বিচ্ছেদ করো - "ইতস্তত |
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Answer» tion:AnswEr:-Let a and d be the first TERM and common difference for an AP.number of terms of AP = nlast term = nth term = lGiven:a = 17D = 9 ,l = 350a + ( N - 1 ) d=nth term=> 35017 + ( n - 1 ) 9 = 350=>( n - 1 ) 9 = 350 - 17=>( n - 1 ) 9 = 333=>n - 1 = 333 /9=>n - 1 = 37=>n = 37 + 1=>n = 38Therefore ,number of terms in given AP = n=38n=38━━━━━━━━━━━━━━━━The terms are:-17, 26, 35....350 17,26,35....350━━━━━━━━━━━━━━━━Additional:How to find the sum of the terms of AP?let Sum of n terms of AP = Snwe know,Sn = n /2 ( a + l )here n= 38 (as we calculated)putting values we get:Sum = 38 / 2 [ 17 + 350 ]= 19 × 367= 6973 |
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