1+2+3+4+5........+n= 365. What number is n?
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it is an AP with common difference 1
LAST TERM = FIRST TERM + (TOTAL NO. OF TERMS _1 ) × COMMON DIFFERENCE
365 = 1 + ( n_1 ) 1
365 -1 = n-1
365 = n
total no. of terms = 365
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0
n = 365 ...
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