Grade 10Algebra
The AP in which 4th term is -15and 9th term is -30. Find the sum of the first 10 numbers
The AP in which 4th term is -15and 9th term is -30. Find the sum of the first 10 numbers
1 Answer
Saurabh Koranglekar
Dear student
a be first term; d be common difference
Let a+3d = -15; a+8d= -30
solving these 2 eq. a= -6; d= -3
S10 = (2a+9d)*5 = (-12-27)*5 = -195
a be first term; d be common difference
Let a+3d = -15; a+8d= -30
solving these 2 eq. a= -6; d= -3
S10 = (2a+9d)*5 = (-12-27)*5 = -195
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