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**lord287** Q1. The sum of first n terms(n>1) of an A.P. is 153 and c.d. is 2. If the first term is an integer, the number of possible values of n is?

Q2. The minimum number of terms of 1+3+5+7+ adds up to a number exceeding 1357 is?

Q3.The number of terms common to two A.P.s 3,7,11,...,407 and 2,9,16,...,709 is?

Q4. An A.P whose first term is unity and in which the sum of the first half of any number of terms to that of the second half of the same number of terms is in constant ratio, the c.d d is?

Q.5 If x,y,z are real numbers satisfying the expression 25(9x² + y²) + 9z² -15(5xy + yz + 3zx) = 0 then x,y,z are in?

a)AP

b)GP

c)HP

d)none

Here are some questions to which I really need an explained answer. I hope I will get answer soon